Selective signaling apparatus.



L M PQTTS SELECTIVE slsumusmmnmus. APPLICATION FYILED OCT. II; 1913 Patented June 5, 1917 ID SHEETS- SHEET I llnlllllul I I "II:

ghuenhn Q 46 43; Q91 rm,

L- M. POTTS. SELECTIVE SIGNALING APPARATUS.

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APPLICATION FILED OCT. I I, I913.

L. M. POTTS.

SELECTIVE SIGNALING APPARATUS. APPLICATION FIL'EIJ our. 1| 191-3;

Ptented June 5 1917 I0 SHEETS-SHEET 5 L M, POTTS. SELECTIVE SIGNALING APPARATUS.

APPLIMTION man oc'T. 1|. ma-

Patented June 5, 1917.

mmmm

l0 SHEETS-SHEET 6.

amount q/vi limzoaea' 1 L. M.;POTTS.' I SELECTIVE SIGNALING APPARATUS.

APPLICATION FILED OCT. .1913.

1,229,201 Patented June 5, 1917.

SLSABCIDELSABCDELS L. M. POTTS.

SELECHVE SIGNALING APPARATUS. APPLlCATlON FILED ocr. H. 1913.

Patented J mm 5, I917.

10 SHEETS-SHEET 10.

UNITED sTATEs PATENT o EIcE.

LOUIS MAXWELL POTTS, 0F BALTIMORE, MARYLAND, ASSIGNOR TO AUSTIN MOLANAHAN, OF BALTIMORE, MARYLAND.

SELECTIVE SIGNALING APPARATUS.

Specification of Letters Patent.

Application filed October 11, 1913. Serial No. 794,833.

ance with this invention, may be substituted for a Morse key, and the receiving meeha-,

nism of such machine for a Morse sounder arrived at by erforming all the operations, as far as possi 1e, by mechanical means, and

in which making the construction such that the accuracy of operation depends upon the mechanical construction of the parts, and not upon conditions which. may vary.

The transmitting apparatuspcr so herein shown and described constitutes the subject of a division of the present ap i)lication, filed May 9, 1916, Serial No. 96,323, Where the invention. such is claimed. A

My invention will be better understood by reference to the accompanying drawings,

Figure 1, is a front elevation of one form of machine embodying my invention;

Fig. 2, a side elevation thereof, partly in section, as viewed from the transmitting side of the machine, much of the receiving mechanism being omitted for clearncss in the drawing;

Fig. 3, a semi-diagrammatic front elevation of the train of driving gears, as viewed from the rear of the machine;

Fig. 4, a semi-diagrammatic view show ing the arrangement of camsoncthe startmg and combination bars, and their relation to the key levers;

Fig. 5, a fragmentary sectional elevation showing the manner of supporting the start ing and combination bars;

Fig. 6, a fragmentary vertical sectional elevation showlng the timing balance and its starting and stopping mechanism;

Fig. 7, a fragmentary vertical sectional elevation showing the mechanism for transmitting the starting impulse, and for creating a lag between signals as hereinafter described;

Fig. 8, a detail perspective view of the movable transmitting contact;

Fig. 9, a fragmentary sectional elevation showing the mechanism for locking the keyboard; c

Fig. 10, a fragmentary sectional elevation showing portions of the selecting mechanism for transmitting the signals, and for receiving the same;

Fig. 11, a fragmentary top plan View,

Patented June 5, 191 7.

partly in section, showing the relation of the controlling magnet armature to the parts which it actuates and controls; Fig. 12, a fragmentary vertical sectional elevation showing one of the receivi .se- I lecting levers in its set-or o 'erated posit-i0 relative to one of the tumb are with whic it is adapted to co-act;

Fig. 13, a fragmentary side elevation,

looking into the receiving side of the ma:

chine, and showing the type-wheeland associated parts in vertical section, many parts of the transmitting mechanism being omitted in this view for the sake of clearness;

Fig. 14, a detail sectional elevation of the type-wl'ieel setting mechanism;

Fig; 14", a fragmentary detail elevation and modification of parts shown in Fig. 14;

Fig. 15, a fragmentary detail section taken on line 15*-15", Fig. 14;

Fig. 16, a fragmentary front elevation of .the stop disk for the control shaft, together with its coacting pawls;

Fig. 17, a detail top plan viewof the tumbler mechanism for setting the typewheel;

Fig. 18, a vertical section thereof;

Fig. 19, atop plan view of the tumbler supporting frame;

Fig. 20, a fragmentary detail perspective view of the cam and of one of the tumblers, together with the upper end of one of the receiving selector levers;

Fig. 21, an enlarged fragmentar Y sectional elevation to show more clearly the arrangement by which the tumblers are retained in a set position;

Fig. 22, a d etail side elevation of the balanee and cscapement mechanism, showing the balance in the act of Oscillating in a counter-clockwise direction;

Fig. 23, a fragmentary detail side elevation. to show more clearly the operative rrlation between the safety-pin and passing hollow of the safetyroller of the escapement mechanism .iiig. 2d, a developed view to show the shapes and relative angular positions in whichthe various combination cams for stopping the type-wheel are arranged upon their supporting shaft;

Fig. 25, a fragmentary top plan.view

showing said combination cams and stop ratchet mounted upon their drlvmg shaft,

and showing this shaft geared to the shaft of the typeovheel; 1

Fig. 26, a developed view to show the permanent or relative angular positions in which the various cams are mounted on the timing shaft;

Fig. 27, a fragmentary top plan View showing the lateral spacing or positions of said cams on the timing shaft, and also showing the friction clutch for operating this shaft;

Fig. 28, a developed View showing the shapes and relative angular the cams on the control. shaft;

Fig. 29, a fragmentary top plan view showing the lateral arrangement of said cams on the control shaft;

Fig. 30, an enlarged detail vertical section of the friction clutch of the control shaf Fig. 31, a similar view of the friction clutch .of the type-wheel shaft and the timing shaft;

Figs. 32 to 37, inclusive, detail views of the type-whecl shift mechanism;

Fig. 38, a fragmentary detail front elevation of the type-whcel and its immediately associated printing mechanism;

Figs. 39'and 4.0, diagrammatic views of opposite faces of the type-wheel to show the arrangement of the characters on said typewheel;

Fig. 41, a detail top plan view of the press-er plate for holding the tape down on the platen and guiding the same;

Fig. 42, a diagram illustrating the current as transmitted for two signals;

Figs. 43, 44 and 45', diagrams illustrating an application of this invention to various types of commercial Morse circuits;

Fig. 46, a diagram illustrating an application of theinvcntion on a short line, as in the case of inter-communicution around a plant or building, or other short distances, and,

Fig. 47, a fragmentary detail elevation among other parts,

board and other positions of. the key levers is elfected by X the beveled edge showing the receiving magnet of my machine reversed from the position shown in Figs. 1, 6, and 10, so as to operate as hereinafter described.

e machine herein shown. comprises,

a main frame which includes-a base 1 on which is supported a keyparts of the machine hereinafter described.

The keyboard comprises a. series of keys 2 and a space bar 3, mounted upon the ends of a series of key levers 4. pivotally supported in the machine frame. These levers are held in alinement by two vertically slotted guide combs 5 and 6, and operate against the tension of springs 7 which return them to their normal positions. The arrangement of the keys is preferably that of a standard typewriter.

The function of these key levers is to operate a starting bar Send a series of coin bination bars 9, 9", 9, 9", and 9, which extend transversely across and above the upper edges of said levers adjacent to theicrcar ends.

These bars 8 and 9- are mounted for longitudinal movement in individual vertical slots 10 in two uprights l1 and 12 on the machine base, and are confined within said slots by horizontal pins 13, 14, and 15, 16. (See Fig. 5.)

The operation of the bars 8 and 9-9 by the engagement of beveled edges 17 of these levers with a series of cams 1.8 on the starting bar, and a series of cams 19 on each combinatlon bar, the said bars being returned to their normal. positions by springs 20.

The starting bar 8 is shifted on the operation. of any of the key levers, and for this reason it is provided with a similar cam lug 18 for each key lever, each such lug having a cam face slanting in such direction as to shift this bar to the right when engaged by 17 of any key lever. (See Figs. 4 and 5.)

The arrangement of cams 19, on the combination bars, however, is different on each such bar as only a certain one or combination of these bars is operated by each key lever.

The arrangement of these cams on the combination bars will vary according to the system of combinations employed. .The arrangement of the cams on all of said bars of this particular machine may be had from Fig. 4. Assuming the vertical dotted lines to represent the positions of the key levers, as viewed from above, the relative positions of the various cams with respect to these levers may be readily obtained. In the particular machine herein shown, the five unit system of combinations is employed, and for this reason there are five combination bars.

Only those cam faces which slant upward individual i from right to left on the lower edges of the the slots 31 by 32 by plate 38'.

combination bars 9--9" act in conjunction with the key levers to shift said bars in the required combinations. The cam faces which slant in the other direction (upward from left to right Fig. l) are merely for the purpose of preventing the depression, dur 1n the transmission of a signal, of some 0t or key than the one operated to send that signal, as hereinafter more particularly described.

The shifting of bars in various combinations by the. action of key levers on cams on said bars is old and well known in the art.

The starting bar 8 is provided on its upper edge with. anotch 21 and cam lNithin this notch normally rests the lower end of a vertically movable slide 23, having a'beveled edge 24: which rests, under the tension of a spring 25, against the cam 22. (See Fig. 7 The starting bar is also recessed as at 26 for a purpose which will be stated later.

Each combination bar 9-9 is provided with a notch 27 and cam 28 similar to those of the starting bar, and these cams 28 are in similar ccx'iperative relation respectively with the lower beveled ends of a series of vertical slides 29", 29", 29, 29 and 29", each of which is held against a cam 28 under the tension of an individual coil spring (See Figs. 2 and 10). I

Slides 23 and 29-29 are mounted for movement in a vertical plane in individual slots 31 and in guides 33 and. 34:, respectively, secured rigidly between. two upright plates 35 and 36 made fast to the frame of the machine as shown most clearly in These slides must travel vertically without any angular displacement and for this rea son are held against such displacement in plates 37 and 38 and in slots Mounted in the same vertical plane with starting slide 23 and extending above it, (see Fig. 7) is a starting lever 39 having a. beveled lower end i0 extending into the same slot in guide 33 as the slide 23. This lever has near its lower end a shoulder -11. which rests upon the upper edge of guide 33, while the upper portion of said lever rests in an open end slot 452 in a guide 4". On one of its edges between guides 33 and 48, lever 39 is provided with a cam 44., the function of which 18 to cooperate, hereinafter described, with a rotatable cam 45 fast on a square shaft 46, journaled for rotation in plates 35 and 36. A spring 47 bears against lever 39 at a point above the axis of ca1n45 and on the opposite side of said lever from said cam so as at all times to exert a pressure on said lever from right to left, Fig. 7. In Fig. 7 the parts are shown in their normal positions, that is, the positions they occupy when no signals arc being" transmittwi. [it such a time, cam will cam. on.

. the starting lever in the central position, as

shown, when the lever 39 will occupy a tilting position. with its foot kicked outward to the right.

WVhen the starting bar 8 is shifted to the times engages a universal bar 49 carried and insulated from a depending arm 50 ot a bell crank lever 51 fulcrumed between two pivot screws 52 and 53 mounted in arms 54: and 55 secured to an insulating, block 56 held between plates 35 and 36. The hori zontal arm of this bell crank lever extends through an opening 57 in block 56, and carries on its outer end an electrical contact 58 which is adapted to travel between and alternately engage adjustable stationary contacts 59 and 60, contact 58 being normally held in engagementwith contact by spring (31 which also acts to hold in 'versal bar 49 against cam extension Contact 58 is carried on a hinged extension on lever 51, the said extension comprising a bent metal plate 62 fitting over the end of said. lever and pivotally secured thereto by pin 63. Spring 61 is attached at one end to extension 62 at apoint in the rear of its pivot, and at the other end to a milled thumb screw 64 by which the tension of the spring may be adjusted. Through the action of hinged extension (32, contact 58 is caused to wipe contact 59 on each engamcnt thereof, and thereby make more certain electrical connection. Wiping coi'ltacts, however, are old and well known. in the art and nothing new here claimed for this detail which may or may not be euualoycd, as desired.

Engagement of contact 59 by contact 58 results in. the con'ipletion of a circuit through the coils of an clectromagnct 65.

As we are not at this time nurticularly (oncorned with any electrical connections, these need not at present be traced. It will simply be assumed that magnet 65 is in series with contacts 58 and 59. The electric circuits will be taken up later on in this description.

Magnet 65 is mounted for vertical adjustment upon a screw (36 carried in a bracket 7 made fast to an insulating block 38 held between plates 35 and 36. This magnet is provided with an armature (i9 pivotallv supported. between two brackets and 71 w-urcd l'o hloclr 68. This armature, except in the arr-a. I snout shown. in Fig. 47, is normally held down against an adjustable stop 72 by a spring 73, the tension of which may be adjusted by thumb screw74f The upward movement of armature 69 is limited by an adjustable stop 75.

Extending over the forward edge of this armature is an arm 76 on a vertically movable slide 77 (see Fig. 6) mounted in slots in two horizontal guide bars 78 and 79 held rigidly between plates 35 and 36, and retained in said s-lcts by plates 80 and 81.

Slide 77 controls the starting and stopping of the timing mechanism, which will now be described.

\Vhcn magnet 65 receives the starting. impulse, as described, it draws armature 69 upward, and this raises slide 77 against the pull of a spring 82. The lower end of this slide when in the down or normal position, acts as a stop for an arm 83 fast-upon the periphery of a balance 84. This balance is fast upon a shaft 85 journaled for rotation in the plates 35 and 36. Vhen the slide 77 is thus sent upward, the balance becomes released and starts oscillating.

This balance oscillates under the control of a helical spring 86 having one end rigidly fastened to the balance at 87, and the other end similarly fastened as at 88 to plate 35, (see Figs. 6 and 13) so that the number of turns in the spring is a whole number,

/ of the signal.

lacking approximately 90 according to the well known practice in chronometer construction. The size of the wire. of the spring 86 and the weight of the balance are so chosen that one-half of a complete (forward and back) oscillation of the balance occupies the ,time necessary forone unit impulse This period of oscillation is chosen as being the most convenient, but is. not necessarily essential. A unit impulse r mld correspond to a quarter period of the osci ation of the balance. It is, however, important that the unit mpulse ccrrespoml to some multiple of the period of the balance.

This balance has on its circumference two mean time screws 89 which are used to bring the balance to the desired standard. This is done choosing screws of the proper weight. If the balance. is too fast, a larger screw is inserted; Two rating screws 90 are inserted in the rim of the balance at about 90 from the screws 89. Screws 90 are used for the purpose of changmg the rate of the machine in words per minute to adapt it to different lengths of line and different operating conditions. The balance is so constructed that it "has a rate equa-ltothe maximum rate desired, and this rate is brought down to that required in any particular case by different size screws 90.

The power w. 'hiactually oscillates tle balance Siis transmitted to at through an, escapem'ent mechanism comprising an 08- a 95 fast on said roller, and adapted to en-.

gage a notch 96 in the lower end of the anchor, and a safety pin 97 adapted to engage passing hollow 98 in the safety roller 94. This escapement mechanism is substantially the same as that commonly known as the lever escapement," used in the clock and watch making art, so need not'here be more fully described.

Escape wheel 91 has six teeth, so that three complete oscillations of the balance Will allow the timing shaft 46 to rotate onehalf of a revolution, which is the length of time required for the transmission of one complete signal. At the end of this half revolution, the rotation of shaft '46 stopped by the engagement ofstop 83 on the balance with slide 77 which drops into the path of arm 83 on the balance, caused by the dropping of the nose of an arm 99 on said slide (see Fig. 6-) into either one of two diametrically opposite notches 100 in the periphery of a cam 101 fast on timing shaft 46. Balance 84 is, therefore, started and stopped at identically the same point each time. Directly after shaft 46 starts to rotate, the nose of arm 99 rides up on the elevated portion of the cam, where it remains until said cam has rotated about onehalf of a i revolution, thereby positively holding said stop slide out of the path of balance arm 83 for the proper length of time.

The timing shaft 46 a is power. driven through a train of gearing (see Figs. .2. and 3) comprising a gear 102 mounted on said shaft and adapted to make driving c0nnec-.

tion therewith through a friction clutch hereinafter described; a pinion 103 mesh ing with said gear and fast to a gear 104 an idler 105 fneshing with gear 104; a pinior- 106 meshing with idler 105 and fast to a gear 107, and a pinion 108 meshing with gear 107 and fast on the armature shaft 109 of an electric motor 110,.

Any suitable source of power, however, may be substituted for this motor. It is not necessary that the speed of the driving mechanism be constant, but only that it is run sufliciently fast. Fora rate of forty words per mmute, for example, shaft 46 should rotate about 175 revolutions per minute.

Gear 102, as above pointed out, is not connected directly to timing shaft 46, but drives 46, and this sleeve is provided with dis , 112 fast toshaft under compression by a recessed nut 115 upon the end, of the shaft 46. A pin 116 passes diam rically through shaft 46,

through the sle ve 111, and into radial slots- ].16 in the hub (if disk 113, thus holding disk 46 both against rotation relative theretoanigl against sliding laterally thereof, and holding disk 113 against rotation relative to sha t 46, but permittingsaid disk to move laterally of said shaft. Therefore, as long as the stop 77 is against balance 4.111183, shaft 46will beheld against rotation, but ais'soon as this stop is removed,

. said shaft is set free and will be driven by the friction between plates 112 and 113 and gear 102. 'When shaft '46 is held against rotat on. gear 102 nevertheless continues to rotate.

Immediately after the t imingfshaft 46' starts to rotate,'ca1n passes from engage:

(See Fig. 7).

ment with slide cam 44.

- This slide will. then be pushed to the left,

underthe action of spring 47 and universal bar 49, whereupon contact 58 breaks connection with contact 59,'unless the combination bar 9'has been operated, thus terminating the starting impulse. If the signal being sent involves the operation of c0mbination bar 9, contact 58 will not break con nection with contact 59 at the time above stated, butwill remain in contact therewith for a: time depending upon. which other of.

the combination bars has been operated for that particular signal. This, however, Will be more readily understood after the operation of the transmission of. the actual signal impulses has been described.

Passing now more particularly to the mechanism which .coiiperates wit-h the 'combination bars and vertical slides 29-29 to transmit the impulses which form the actual signals as contra-distmguished from the 2 starting impulse, this comprises, anion other parts, five cams 117, 117, 117", 117 and 117 fast upon the timing shaft 46, which cooperate respectively with five transiuitting levers 118, 118", 118', 118 and 118 in operate tl'irough the universal bar 49 the nun-"able contact 117 --1 17 are all of the same shape and are so arranged on the shaft subheading ones of said cams (117-- ii) a e angular-1y displaced 30 behind the prweding one about the axis of said shaft (who Fig/26) andare held against lateral immanent on said shaft by spacing collure 46''.

The transmitting levers '118118.are mounted in the same vertical planes respectively with cams ll'l -ll7 and to one and 113 by a spring 114 held 2 and 10. The upper ends of these levers rest in individual open'e'nd slots in ide bar 43, while their lower ends exten into the same slots in guide 33. as receive the upper ends of the slides 29+29, said levers being supported upon the upper edge of guide 33, each by a lug 119, and their upward movement limited by lug 120 engaging the lower side of theguide (See Fi 10). Each of these levers is normally he d in the position shown in Fig. 10 underthe tension of an individual spring 121, bearing upon the backs of said levers at a point higher than the axis of shaft 46. The levers side thereof as shown most clearly in Figs. 7

118 -118'each have a cam 122 adapted to be engaged each by a different one of cams 117117, and each lever is also provided with an extension 123 adapted to engage universal bar 49 of the transmitting contact lever. The operation of these levers 118"*-118 by the slides 29-29 is substan-'v tially the same as that described with relation to the starting lever 39. According to which of the slides 2929' is or are raised by the operation of any particular key,.'the lower ends of corresponding levers 118 118 will be held by said slides against move ment to the right. Then, as shaft 46 continues its rotation, cams 117-117 will successively engage'cams 122 on levers 118*- 118". Clearly then, those levers 118'118 the lower ends of which are restrained from movement to the right by the operated slides 29-29 will move to the right attheir upper ends, and in so doing will act through the universal bar 49 and lever 50 to effect engagement of contact 58 with contact 59.

The levers 118118 are. returned to normal by springs 121 and universal bar 49, the latter action under the tension of spring 611 As to those levers 118"---118 whose slides 29=--29 have not been operated, the case is different. These levers being less restrained at their lower ends, than at their upper ends, due to the pressure of springs 121 and 6]., above the axis of cams 46, will kick out at their bottoms to the right. Therefore, the extensions 123 of these levers have no operative effecton the bar 49, and hence will not operate contact 58. Each of the levers 1l8 --118 is capable of two degrees of 1notion, but restrained from movement by unequal pressure in two degrees, the cams 117 417 tending to operate said levers in succession, and the slides 29-29 selectively acting to positively lock said levers from motion in the way of least restraint and to compel their motion in a direction of greatest restraint. I

Each signal period may be regarded as divided into six equal time intervals corre sponding to the six beats or half oscillations of the balance, and represented diagrammatically in Fig. 42 by the spaces indicated S, A, B, U, D and E between the vertical dotted lines. Each of these intervals represents the time that the contact 58 remains a ainst the contact 59 to transmit a unit impu se. The space S indicates the in terval of the starting impulses, and the spaces A-to E the intervals of the five unit signal impulses which are employed in various combinations to form the signals proper.

In Fig. 42 the solid lines above the line 0-0'0f zero current represent the current on'thc line when two signals are transmitted, one callin for the B G combination, and the other or the A B C D E combination.

In the case of the signal calling for the A B C D E combination, the current is continuously on the line from the commencement to the end of the signal period, as in dicated, embracing all the spaces S to E.

Combinations of impulses may therefore be formed ranging from the employme'ntof one impulse for each of the spaces A to E, to the employment of one impulse of a duration equal to all such intervals combined.

.Vith ,the five unit system here employed,

tliirty two such combinations maybe had.

It will be seen that whenever a combination is transmitted which involves the A 1mpulse-position, the starting impulse does not 'fall to zero, butmerges intothe A impulse.

This is due to the fact that the operation of the combination bar 9f,'which sends the Aimpulse, operates through slide 29, lever 118 Which holds the universal bar 49 out and the contacts 58 and Y59 closed notwithstanding.

cam has passed from the starting lever 39. (See Fig. 7).

The exception, mentioned in a foregoing portion of'this description, to the fact that on' the passage of cam 45 from cam 44. the contacts 58 and 59 separate, will now be more fully understood.

The spaces indicated L represent the lag Iwhich is automatically produced between successive signals, when the machine. 1s'oper'uted at maximum speed, as hereinafter more particularly described.

The combination for each signal may be had-' from Fig. 4 by noting the relation be tween the dotted lines indicating the key levers, and the cam lugs on the different combination bars '9 ,9". These combination bars correspond to the five impulse periods A to E Fig. 42, the impulses being transmitted in combinations depending upon which of said. bars-are o erated. For ex. a ple, the operation of t e 9 and 9" bars w ill send the A B impulse combination, the operation of the 9 bar the (l impulse, etc.

There should always be between succes- .sive'si"gnals a lag great enough toiprevent any signal from blendingwith the starting. impulse of a succeeding si nal,"-a'nd' this lag ,shouldpreferably be-equa to the time ofa is. obtained.

unit im ulse in order that at any given speed 0 transmission the length of the line operable may be a maximum. When the machine is not operated at its maximum speed, a natural lag will be produced between successive si nals due to the pauses of the operator. hen, however, there are no such pauses by the operator, some means should be provided for automatically producing this lag. This is effected in the present machine by providingmeans which will automatically retard-the action of the contacts 58 and 59 in closing to send the starting impulse of a signal, under the-conditions above stated. For this purpose, starting lever 39 (see Fig. 7) is provided at its upper end with an offset or hooked extension 124, and adapted to cooperate, as hereinafter described, with this extension is a'pin 125 carried by a slide 126 mounted for "vertical movement in fixed guides 127 and 128, said slide being normallypulled down under tension of a spring 129. This slide is provided with a downwardly exteuding arm 130 having a beveled end adapted to rest upon the periphery of a cam '131 fast on the timing'shaft 46. Now, as cam 131 "ro'.

tates, it raises slide 126, and as thi-s'slide- I nears the extreme end of its upward motion, pin 125. engages the hooked extension 124 of lever 39 and raises this lever so that its lower extremity cann'ot engage the upper e'nd'of slide 23 even when a key is depressed,

so that contacts 58 and 60 will remain closed with .the upper tip of slide 23, "and. this.

rocking motion of lever 39-causes the engagement of contacts 58 and 59 and the transmission of the stu rting unpulse. Therefore, when the machine is operating at maxi mum speed, with no pauses by the operator between-successive signals,-the starting impulse is always sent by the downward movement of slide 126 rather than by the upward motion of slide 23,thereby causing a delayed closing of the contacts 58 und-59 for the starting impulse. The weight of slid e 12'6,

the strength of spring 129, and thedrop of slide 126 are so chosen that the desired lag Before passing to the reception oft he sig-' n'als the key locking mechanism will be de-' scribed.

Normally all of the keys of the keyboardare unlocked. The operation of any key,

however, not only locks that *l'rev' un'dTi-lts other keys and their combination bars as Well, against further operation until the completion of the signal. This is effected by the following mechanism. (See Fig. 9)

Each C(HHblDtttlOIl bar 9 9 is provided on its upper edge with two notches 132 and 133. Extending. transversely across all of these combination bars and, in the minrniial or unoperated position of said hars lying d.i rcctly above notches 133, is a locking bar 134 having a knife edge adapted to engage with said. notches. This locking, bar is carried on the lower end of a slide 13:3 adapted. to move vertically in guides 42: 33 and 3-1. This slide is provided with an offset ext usion or arm 136 having a cam portion 13"? adapted to lie in the path. of a rotatable cam. 138 made fast on timing shaft 46. Normally this cam occupies the position Sl'IlUWll. in Fig. 9, at which time it holds slide 1.35 in the elevated position shown, under the tension ofa downwardly pulling spring 139. lmmediately after the timing shaft 46 is started into rotation, as described, cam 138 from. cam 137, thereby allowing slide 135 to be pulled. downward. When this llz'LjIJ'pBIlS, the knife edge of bar 134 will. be sent into notches 132 of the operated combination bars and into notches 133 of the unoperated com-- bination. bars, thus looking both sets of bars against further operation until the signal has been transmitted. When it attempted. to depress any of the keys din-lug th ans mission, they will be held from oper: 1.l:.ion by the cams on the combinatirm oars. At the end of a s gnal pieriod, or when the timing shaft all has made a half revolution, ram 138 will. again raise slide 135 and unlock the key hoard.

The notch 26 on the starting bar merely y to allow locking bar 13 1 to descend.

In addition to the transmitting mechanism described, this machine embodies certain novel receiving mechanism which. may act either to make a homerecord of the signals sent out from the machine, or to record sig nals from a distance orboth, said. receiving mechanism in each machine being under the .initial control of a single magnet For the purpose of thus recording the signals, the following mechanism is inovuiled in v1 the mach me he rem shown:

' Located on the opposite side of timing; shit from the transmittinglevers l'l8-- l9 are a series of live receiving lo 140, 14.0. and 14:0? lying in col vertical planes with the levers ill and in operative relation and ailim unit in correspolu'ling vertical plain "is Levers l ttl 14110 are moon in in individual vertical open end slots in. the guides 78 and 79. These levers can arrive outward to the left in Fig. 10 'u said slots at either the top or the bottom, but are nor-- mally held back by springs 1411, one for each lever, which are placed at an angle, so that as well as holding levers lam-"140 to the right, also exert a pull upward thereon. These springs are omitted in Fig. 13, for the:- sal're of clearness in the drawing. In the normal positions 1.4cO--14ll shown in Fig. 10, a shoulder H2 thereon rests against the lower side of guide bar 78. Each of these levers is provided with a horizontal extension 143, the normal position of which is slightly higher than the free end. of thearmature 69 when the latter is in its normal or down position. 'lhisarmature broad enough to engage all such projections, as shown in Fig. 1.1.

As shaft a6 l'll titttls, cams 117---117"" successively engage cam projections .144: on the receiving levers, and if the armature 69 were in its down position, shown in Fig. 10, the

lower end of each of said levers would. be

kicked to the left by said cams. But, if at the time when cams 117 -117 engage levers 1 l-0 ----14:0, magnet happens to be energized, arl'nature 65.) will then be in alinement with extensions 1&3, as indicated in Fig. 12-,

and instead of the levers 140 1-440" kicking to the left at their lowerends, the upper ends of said levers will move to the left. In

other words, each of the levers tO-14=0 is capable of two degrees of motion, but is restrained from movement by unequal pressure in two degrees, cams 11'T-117 tendin h tov Ojfllfil'iiitfi said levers in succession, and ar j ma" ie 69 selectively acting to positively." loch". said levers from motion in the direction of least restraint and compel. motion of these lovers in a. direction of greatest re-' straint. Tl'ierefore, the upper ends of these levers will be kicked. to the left in combinations corresponding to the impulses received by the magnet 6?. v y

The lugs 14% of the receiving levers are so positioned that cams 117-11T 'engage them .-.-:l.ightly after said cams have passed their horizontal position. Cams 117--117-* are stop n-d by the escapement in the horizontal positim which position the middle of the came .12?" (see Fig. 10). and consequently the mirhlle of the sent impulse, so that cams 11.7 117 do not amiarently engage lugs Ill-l until. somewhat after the auiddle of the we. impel; But due to the lag in the operation or magnet 65, this actually occurs at almu lz the midd lo of the impulse. By a pmpcr lorev u of ra ns l t-l.- and the slip of the clutch of shaft 4.6 it may he brought at any (losirod point of the impulse. The cams ll? i 1.7"" of course engages lugs 1' 1; only till! or a small part of the time occuyned 1n of levers 70 14$.) in the rear end of each tumbler.

be good during the sterval in which any of the cams 117*117 engages a lug 144.

The function of levers l4()140 in this machine, is to selectively control the setting of a type wheel, and for this purpose copperate respe .'ti\'ely with a series of five tumblers 145, 145", 145, 145 and 145. (See Figs. 10, 13 and 17 to 21). Each of these tumblers comprhacs in the case shown, a bar having a bifurca'tml end 146 supported upon a square rock shaft147, which carries a series of guide pins 148 which engage slots These tumblers are supported forward by resting on a plate 150 which forms a web between two arms 151 and fast on shaft 147.

Each tumbler is pulled in the direction of extension 157 adjacent cam 156, between.

which and the stem of the tumbler there is formed a recess 158 into which extends the forward edge of plate 150. (See Figs. 18 and 20). Each of these tumblers may move in a horizontal plane about guide pins 148 as pivots, and each tumbler has two positions of rest from whichit may be thus moved. This movement of the tumblers is effected by the engagement of the upper ends of levers 140-140 with the cams 155, 156 on these tumblers, when said tumblers are brought down on the upper ends of said levers hereinafter described, and for this purpose the upper end of 93ml]. lever 140 -140 has two oppositely directed cam portions 159and 160 (see Fig. 20) adapted to engage respectively with tumbler cams 155 and 156.

For the purpose of retaining or locking each tumbler in its shifted. position until again operated by one of the levers 14.0140 the forward edge of plate 150 is provided with a series of pairs of indentations 1-61 and 162 (see Figs. 17, 19.and 21), each pair corresponding to the two positions of rest of a tumbler, the said indentations adapted to engage with a detent cam 163 (see Fig. 21) on each. tumbler.

' 163 are retained in said indentations under the pull of springs 153, which yield to allow the said cams to pass from one indentation to another.

The function of these tumblers is to interlock by means of lugs 154 with a series of pairs of combination cams 164 164*, 164, 164. and164 and thus to control the stopping of the type wheel in the desired position.

For each of said tumblers there is one pair of such cams, or ten camsin all for a complete machine. The shapes of these cams are shown most clearly in Fig. 24. In all cases the closed part of its mate.

The cams open part of one cam corresponds to the Each cam has half of its circumferencehigh and half low, but the arrangement of these parts is different in each set or pair of cams. The cams 164 for example, each have 180 high and 180 low in extent; cams 164 have two 90? sections high and two 90 sections low; the

cams 164, four 45 sections high, and four low, etc. These cams are then all so spaced angularly about a common horizontal axis comprising a square shaft 165 on which all said cams are made fast, that for any possible combination of said positions of rest of the tumblers. there will. be one position and only one where all the lugs 154 on said tumblers will find an opening in all the cams which they engage. The cams 1 4164 may assume a variety of shapes different from those shown, so long as they satisfy the above condition.

Mounted fast on the same shaft 165 with cams 164*164 is a ratchet l66fhavigng a tooth for each stopping position of the type-Wheel. This ratchetis adapted tobe engaged at times by a pawl 167 on arm 152, and when so engaged holds shaft 165 against rotation. This shaft receives its power through a train of gearing which includes gear 168 fast on shaft 165, and meshing with a gear 169 fast on the typewheel shaft 170, a friction clutch 171, including fiber gear 172 (Fig. 1) and gears 173 and 174, the latter two being made fast to each other, and gear 174 intermeshing with gear 102, which lat ter receives its motion from the electric motor as hereinbefore described. This friction clutch 171 is the same in construction as the friction clutch of the timing shaft shown in detail in Fig. 31, and therefore need-not be further described.

Shaft 147 (Fig. 14) is adapted to be rocked on its axis by an arm 175 which is rotatably mounted on a collar 176 (Fig. 15) fast on said shaft. This arm rocks shaft 147 through a pin 177 secured to collar 1.76 V

and extending into a slot 178 on the head of said arm, this slot being of such length as to allow a certain amount of lost motion be tween the rotation of arm 175 and shaft 147, the purpose of which will later appear." The arm 175 is provided with an upward extension 179 adapted to engage a lever 180 fast on a shaft 181, Which shaft also carries pawl 182 fast thereon. Pawl 182 is normally pulled to the left, as shown in Fig. 14, by spring 183 secured thereto.

Arm 175 carries a pin 184 which is adapted to rest upon the periphery of a cam 185 mounted fast on the control shaft 186, and normally occupies the position shown in Fig. 14.

Shaft 186 is driven by a' friction clutch 187 from power received through gears 103 normal to their set j lllfnlll llllli l'll'ili'lilmii sleeve 1.88 of. fr1..tion disk 189 is longer than sleeve 111 (Fig. 31) and. the outer friction disk 190 instead of beuringngainst the outer face of gear 101 bears against a fiber friction disk 191 first on sleet e 185, end this disk 191 in turn hes flat against a friction disk 192 fast to pinion 103, which latter is made feet to gear 104:, and the two are re tntablo on sleeve 188. Gear 101', as in the case ofthe-other clutches, is of fiber. The other parts of the clutch including spring 193, not 19- 1 and holding pin 1% are also the some as in the other clutches. When shaft .186 is held, hereinafter described from, rotation, lU-lwill rote-ti" without said shaft, but soon said shaft is leased, it takes up rotation from gear 10 1 through the friction clutch 187.

Shaft'iSG is nornnilly held against rotation. by a pawl 196, the head of which. en one of two lugs .1117 on a stop disk 198 fast on control shaft 186 (Fig. 14,-).

Tl'iis lever is forced against sold disk under the action. of it s iring 191:, and carries upon i up 'ier edge n. his; 2001mm]; ed to be engu :d by n emn E 101 fast on the .i'niingz shaft Immediately before this timing sl f i til the end. of a. signal IlBI'lLMl, on. the head of pawl 196 out of the puth of lugs 197. This. frees shaft 1.85, when it up its rotation through friction clutch 187 from. the train of gearing hereinbefore described. (lam 185 is thereby set in rotation and, acting through .pin 18% sends ern'i 175 to the r ll; Figs. 1 and 14. This arm ecting through extension 179 and lover 180 lows spring 183 to pull pawl 182 into en.-- gogelnent with ratchet 1.611. The movement of the itl'l'l'l 17 up to H115? point has taken place without rocking shaft 1e17, due to the lost motion. between pin 177 and slot 178. So at the time that puwl 182 engages ratchetlfill, pmvh 167 has not disengn id said ratchet. l urther motion of the or. a. 175 to the right, however, tithes up this 1 t n'iotion,

i when shaft 14-7 will rotate miti-iiiloekwise (F 1g. i l) and witlnilrmv pawl lbl .froi'i'r lfif'i on rorrefmoi mud shift suid tumblers fron'i l m b particular tumblers have not already been set by the previous signal. still further motion of arm 17 5, to theright Fig. 11, will cause the tumblers to push the operated or set levers 140- 140 down to their normal positions, ready for the reoeptionof the next signal. If any of the tumblers have been set by a, previous signal, and do not enter into the present combination,- then tumbler cams loo will engage the upper ends of these levers 1410--110* which. will return these tumblers to their normal ositions. lVhen e tumbler is thus'shifted roIn its set position, it causes lug 154 to move from alinement with one earn of its pair of co1nbination omns 1.64 164 to the other. 1

All of these levers 1 10-1-i0' are now in their normal. positions, and the signal has been transferred to the tumblers.

Cam 185, however, continues to rotate until either of .the lugs 197 on stop disk 198 has rotated 90 from its initial starting position, when it will engage with a pawl 202 and stop the rotation of the control shift and earn 185.

Before com 185 is thusstopped, pin 184 clears the elevated. portion of said cam, and when this takes place shaft 147 is rotated clockwise (Fig. 14) wider the poll of spring 203 acting on. an arm 2071 an extension on collar 1.76 fast to s. slm ft. (See Fig. 15). Such rotation of sluift 14:7

with. which they are in alinen'lent, said lugs being held. against said cams under the ten sion of spring;

A spring .2951 acting through a-rm 179 takes up the lost motion between arm 17 5 and pin 177. and, pulling iii-In 17 9 to the right (l ig. lal.) relezises pawl 182 from ratchet 166, end as the pawl. 167 is at this time also out of engagement with ratchet "Hi6, shaft 165 is now free to rotate. This shaft now starts into. rotation under power received through. its friotion clutch. This causes cams 1.6-l='---1G- to rotate. and by so doing to bring their peripheral openings intdregister with the lugs 1 of the tom-- Help. The (:EHIIS 164 464 will thus rotate until they 11inch that position where all the tul'nliiler lugs 1:14: find com openings in which they new simultaneously enter. When tl'lese tumbler lugs pass into the openings in said coins, shaft 147 continues its clockwise rotation (Fig. 14) sending pawl 167 .into engagement with ratchet 166, thus stopping the rotation of shaft- 165, which in turn stops :1 type wheel205 in. the printing position.

wheel passes to its printing positiol'i by n eont'ini'lous motion from its last printing position. end this is it great advantage over stc i'i-b step imminent of the type wheel from one printing position to another, since it saves considerable time and permits. the

' with this type wheel is shown most clearly 'in Figs. 1, 3, and 38, and comprises, among other parts, a print lever 20:7 fulcrumed on a shoulder screw 208 secured to the outer face of plate 35, said print lever carrying rotatably mounted thereon, a circular platen 209 which also serves as a paper feed roller;

Over this platen is adapted to pass a tape 210 of paper or other desired material upon which the printing is to be effected. tape in the machine shown is carried upon a reel 211 mounted on a bracket 212 secured to the base of the machine.

This tape passes from reel 211 first through two open end slots 213 and 214 in a presser plate 215, then over the platen, and then between guides 216 at one end of said plate, to a receiving plate 217.

The presser plate 215 is bifurcated, as shown most clearly in Fig. 41, to permit of the passage of the type between its arms 218 (Fig. 41). This presser plate is pivotally secured through two side arms 219 and screw support 220 to the print lever 207, and holds the tape down on the platen under the tension of coil spring 221 (Fig. 2).

. The platen is under tension of a spring 222, the effect of which is to constantly tend to send said platen toward the type wheel, but the platen is normally held away from the type wheel in the position shown in Fig.

1 by a cam 223 fast on the control shaft, said cam acting through a pin 22& on an arm of the print lever.

Mounted on the, same stud 225 with the platen, and fast to said platen for imparting rotation theret0,is a ratchet 226 (Fig. 38) which is adapted to engage with a pawl 227 which is under tension of a spring 228.

Also engaging this ratchet is a holding pawl 229 pivotally mounted on the print lever near its forward. end, an having a roller 230 adapted to be held in engagement with the teeth of said ratchets 226 under tension of spring 231.

Arm 175 carries near its lower end a pin 232 which, immediately upon the stopping of the type wheel, engages pawl 202 and releases the control' shaft 186, allowing it to make a quarter revolution. This rotation of shaft 186 rotates cam 223 and after this cam has rotated in the direction of the arrow, Fig. 1, something less than 90, pin 224 will drop from the elevated portion of This said cam to the lower, under the action of spring 222. This causes print lever 207 to send the platen upward and consequently the tape 210 against the type on the peripheryof, the type wheel.

In the upward movement of the print lever, pawl 227 passes from one tooth to the next of ratchet 226. Then, as cam v223 continues its rotation, pin 22% rises on the elevated portion of said cam, causing the platen to recede from the type wheel and rotate under the action of ratchet 226 and pawl 227, consequently advancing the tape one space.

\Vhen cam has completed a quarter revolution, one of the lugs 197 on stop disk 198 engages pawl 202 and stops the control enough usually for a printing telegraph. In

using such code it is therefore desirable to have a double type wheel and shift, thus increasing the number of available signals to sixty-four.

The type wheel shift mechanism in the present machine is shown in detail in Figs.

characters as indicated in Fig. 39.

This type wheel carries on its inner face a plate 240 s idable friction. tight thereagainst, said plate being secured to the type wheel by two screws 241 and 242 which pass through slots 243 and 244:, respectively, in said plate. Inserted between the heads of said screws and the plate 2i0 are two small spring plates 245 and 2&6.

Plate 240 carries two projections or arms 247 and 248 ii of a circumference apart, as hereinafter described, which are adapted to be engaged by a projection 249 on the print lever. Arms 247 and 243 are so arranged that they come into the printing position when their corresponding signals are received.

Plate 240 is provided also with two other I 

